Gas-filter.



FREDERICK DEACON MARSHALL AND SIDNEY HERSEY, OF WESTBIINSTER, LONDON ENGLAND.

GAS-FILTER.

Specification of Letters Patent.

Patented Aug. 20, 1907.

Application filed October 6,1906. Serial No. 337,781.

To all whom it may concern:

Be it known that we, FREDERICK DEACON MA SHALL, residing at Queen Annes Chambers, and S11) NEY HERSEY, residing at 141 Palace Chambers, Bridge street, both in the city of Westminster, London, England, subjects of the King of Great Britain, have invented new and useful Improvements Relating to Filters, of which the following is a specification.

This invention relates to filters chiefly intended for use in connection with the purification of gas but also applicable for other purposes, the said invention comprising certainimprovements in the construction whereby the efiiciency of such filters especially in respect to handling the same is increased and their cost reduced.

Heretofore filters as used in connection with the filtration of gases have usually contained several superposed sets of gratings arranged horizontally through which the gases pass upwards from below. This construction necessitates the use of a considerable number of such frames in order to enable the gas to pass through a sufficient quantity of filtering material: furthermore, the operation of removing the filtering material is a tedious and difficult operation because the use of these horizontal frames necessitates not only the removal of each set of gratings separately but also the employment of supporting pillars and bearer bars which interfere with the freedom of workmen cleaning the purifying chamber.

According to our invention we dispense with the ordinary horizontal grid or grating, supporting pillars and bearer bars and employ rectangular frames or racks which are arranged vertically and which carry between them supporting bars or grids upon which the filtering material is laid and which frames or racks can be lifted out bodily, or tilted into a receptacle ranged alongside them. In practice in the former case side boards or covers may be employed to convert the frame or rack into a more or less closed box.

To enable our invention to be fully understood we will describe the same by reference to the accompanying drawing, in which Figure 1 is a side view of a frame or rack constructed according to our invention. Fig. 2 is an end view of the same, and Fig. 3 is a plan. Fig. 4 is a section on the line 4-4, Fig. 1. Fig. 5 is a view showing how a series of racks may be arranged to stand upon the bottom of a purifier. Figs. 6 and 7 are respectively a side view and end view illustrating a slight modification.

a, (1 indicate the vertical rectangular frames, and b, b the grids thereof, the several sets of grids of each rack serving to support the filtering material.

In practice a series of racks constructed as hereinbefore described is arnnged to be introduced into a chamber and in order to afford rigidity the rectangular frames are provided with cross-pieces c, c which project beyond the sides thereof in such a manner that when the frames are placed together the said crosspieces come into contact to give the desired rigidity and at the same time prevent the frames from coming into close contact thereby leaving gaps or spaces through which the gas may pass laterally between the frames.

In order to prevent the racks from binding one against the other when being lifted out we advantageously make one of the said racks of a wedge-shape, as shown in Fig. 5, so that directly this wedge-shaped rack is lifted the necessary freedom will be provided. Instead of using this wedge shaped rack we sometimes provide a series or sets of frames some of which are arranged vertically in accordance with our invention and some horizontally as has heretofore been the practice, the removal of the horizontal frames allowing of the ready removal of the vertical frames.

To facilitate the removal of the purifying material from the vertical frames we sometimes lowcr into the filter a shallow box (or boxes) and tilt the framcs over so that the material falls into the box which is then removed from the filter. The empty frames are then shifted laterally in the filter and refitted in the space from which the purifying material has been removed. As an alternative for facilitating the removal of the material, we lower a casing or casings over the vertical frames which inclose the material in same and then remove the frames, casings and material out of the filter.

It will be understood that the construction of the grids may be varied according to requirements. In

the drawing (Figs. 1 to 5) we have represented racks with live sets of grids the four upper sets of which are each composed of bars of the kind described in the specification of British Patent No. 15948 of 1903 granted to Frederick Deacon Marshall and which bars are i nserted through suitable holes in the rectangular framcs a, a. Upon these bars the filtering material filled into the racks will, as it scttlcs,.bc supported in the form of arches as described in the said former specification. The lowermost grid, which is supported upon the crosspieccs c, c is, as shown, formed of a series of bars I), I) bolted together, the said bars being of such a nature that they will prevent the filtering material from f alling through into the bottom of the filter chamber and so obstructing the flow of the gas to be purified into the said chamber.

As shown in Figs. 6 and 7 the lowermost grid is represented as composed of a series of angular bars similar to the bars of the upper grids, but in this case the said bars are placed closer together. Although we have represented the lowermost grid as being carried by the vertical frames a, a the said lowermost grid may, if desired, be arranged independently in the bottom of the filter chamber and racks arranged in accordance with our invention supported upon it.

In addition to facilitating the emptying and recharging of a filter with filtering material, as hereinbefore indicated, our invention possesses the further advantage that it permits of constructing the purifier or filter o't' considerably greater vertical height than has heretofore been practical.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that What we claim is:-

1. A rack of the kind described comprising vertical supporting frames, and horizontal bars supported by said frames, said bars being arranged in horizontal tiers one above the other, said vertical supporting frames being so constructed at their lower ends as to stand in a truly vertical position when placed in a filter whereby a series of racks may be arranged side by side in a filter to increase the area of the horizontal tiers of bars and intermediate racks may be removed without displacing adjacent racks, substantially as described.

2. A rack of the kind described comprising vertical supporting pieces, a plurality of horizontal bars arranged in tiers one above another and a grid beneath said grid being supported substantially as dehorizontal bars, said bars and said by said vertical supporting pieces, scribed.

3. In a filter, the combination with a plurality of racks arranged side by side, each of said racks comprising horizontal bars, said bars arranged in tiers one above another and vertical supporting pieces for said horizontal bars, said vertical supporting pieces of certain of said racks being wedge shape, of means for rigidly holding said racks out of contact with one another, substantially as described.

4. In a filter, a plurality of racks arranged side by side, each of said racks comprising vertical supporting pieces and horizontal tiers of bars supported thereby, the supporting pieces of one of said racks being tapered toward their lower ends, substantially as described.

5 A rack of the kind described comprising a pair of vertical supporting pieces provided with a plurality of corresponding apertures therein, said apertures being arranged in rows one above another, a plurality of horizontal bars having their ends fitting in said apertures -in said vertical supporting pieces and a grid beneath said horizontal bars, said grid being supported by said vertical supporting pieces, substantially as described.

FREDERICK DEACON MARSHALL. SIDNEY HERSEY.

Witnesses .TonN E. BOUSFIELD, C. G. REDFERN. 

